CN215817508U - Input overvoltage protection circuit of low-voltage lamp - Google Patents
Input overvoltage protection circuit of low-voltage lamp Download PDFInfo
- Publication number
- CN215817508U CN215817508U CN202121251051.3U CN202121251051U CN215817508U CN 215817508 U CN215817508 U CN 215817508U CN 202121251051 U CN202121251051 U CN 202121251051U CN 215817508 U CN215817508 U CN 215817508U
- Authority
- CN
- China
- Prior art keywords
- circuit
- input
- output
- switch
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses an input overvoltage protection circuit of a low-voltage lamp, which comprises an input connection end for connecting commercial power and an output power supply end for connecting an LED power supply, wherein the positive input end of the input connection end is connected with the positive output end of the output power supply end; when the voltage of the input power connection end is smaller than a set value, the second switch circuit is switched off, and the output of the switch charging circuit controls the first switch circuit to be switched on. The utility model can effectively protect the LED power supply from being accessed mistakenly and prevent the LED power supply from being damaged by overvoltage.
Description
Technical Field
The utility model discloses an input overvoltage protection circuit of a low-voltage lamp, and belongs to the field of LED illumination.
Background
The LED lamps in the market at present basically adopt low-voltage LED lamp beads, the power supply mode adopted by the lamp is that mains supply is connected with an LED power supply and then connected with the LED lamp beads, and in different countries or regions, the adopted mains supply voltages are different, for example, the standard voltage of the mains supply in China is 220 volts and 380 volts, the power supply voltage of the mains supply in the United states is generally 120 volts, and the mains supply voltage also has fluctuation. Because mains voltage is much higher than the operating voltage of LED lamp pearl, consequently the LED power can play the effect of step-down. In design, an LED power supply is generally designed for a specific access voltage, and if the LED power supply is mistakenly accessed to a commercial power higher than the designed voltage, the output voltage of the LED power supply will increase, and when the access voltage exceeds the designed value too high, the power supply will be easily damaged.
SUMMERY OF THE UTILITY MODEL
The utility model provides an input overvoltage protection circuit of a low-voltage lamp, which can effectively protect the mistaken access of an LED power supply and prevent the overvoltage damage of the LED power supply.
The utility model relates to an input overvoltage protection circuit of a low-voltage lamp, which comprises an input electric connection end for connecting commercial power and an output power supply end for connecting an LED power supply, wherein the positive input end of the input electric connection end is connected with the positive output end of the output power supply end, the negative input end of the input electric connection end is connected with the negative output end of the output power supply end, a first switch circuit is arranged between the negative input end and the negative output end,
still include sampling/control circuit, second switch circuit and switch charging circuit, sampling/control circuit's input is connected in the positive input with on the wire between the positive output, sampling/control circuit's output is connected in second switch circuit's signal input part, switch charging circuit's input is connected in the positive input with on the wire between the positive output, second switch circuit's input and first switch circuit's signal input part parallel connection in switch charging circuit's output, second switch circuit's output is connected in on the wire between negative input and the negative output and is located first switch circuit is close to one side of negative input,
the sampling/control circuit collects the voltage of the input power connection end in real time, when the voltage of the input power connection end is larger than or equal to a set value, the second switch circuit is controlled to be switched on, the output end of the switch charging circuit is communicated with the second switch circuit, and the first switch circuit is switched off; when the voltage of the input power connection end is smaller than a set value, the second switch circuit is switched off, and the output of the switch charging circuit controls the first switch circuit to be switched on.
Furthermore, the sampling/control circuit comprises a sampling circuit and a control circuit, the sampling circuit is used for collecting the voltage of the input connection end in real time, and the control circuit is used for controlling the on/off of the second switch circuit according to the voltage collected by the sampling circuit.
Further, the first switch circuit is a first MOS transistor.
Further, the second switching circuit is a second MOS transistor.
Further, the power supply device also comprises a rectifying circuit, wherein the rectifying circuit is arranged between the input power connection end and the output power supply end.
The utility model has the following beneficial effects:
according to the input overvoltage protection circuit of the low-voltage lamp, when the voltage of the input power connection end is larger than or equal to the set value, the second switch circuit is controlled to be switched on, the output of the switch charging circuit is connected through the second switch circuit, the first switch circuit is switched off, and therefore the circulation loop from the input power connection end to the output power supply end is cut off, the LED power supply is prevented from being damaged by overhigh voltage, and the LED power supply can be effectively protected in time when the LED power supply is switched in mistakenly.
Drawings
Fig. 1 is a block diagram of a low-voltage lamp input overvoltage protection circuit according to the present invention;
fig. 2 is a circuit diagram of an input overvoltage protection circuit of a low-voltage lamp according to the present invention.
Detailed Description
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Referring to the attached drawing 1, the embodiment of the utility model discloses an input overvoltage protection circuit for a low-voltage lamp, which comprises input electrical connection ends (L, N) used for being connected with mains supply and output power supply ends (Vin +, Vin-) used for being connected with an LED power supply, wherein a positive input end L of the input electrical connection ends is connected with a positive output end Vin + of the output power supply ends, a negative input end N of the input electrical connection ends is connected with a negative output end Vin-of the output power supply ends, and a first switch circuit is arranged between the negative input end N and the negative output end Vin-.
Still include sampling/control circuit, second switch circuit and switch charging circuit, sampling/control circuit's input connect in positive input end with on the wire between the positive output end, sampling/control circuit's output connect in second switch circuit's signal input part, switch charging circuit's input connect in positive input end with on the wire between the positive output end, second switch circuit's input with first switch circuit's signal input part parallel connection in switch charging circuit's output, second switch circuit's output connect in the negative pole input end with just be located on the wire between the negative pole output end first switch circuit is close to one side of negative pole input end.
The sampling/control circuit collects the voltage of the input power connection end in real time, when the voltage of the input power connection end is larger than or equal to a set value, the second switch circuit is controlled to be switched on, the output end of the switch charging circuit is communicated with the second switch circuit, and the first switch circuit is switched off; when the voltage of the input power connection end is smaller than a set value, the second switch circuit is switched off, and the output of the switch charging circuit controls the first switch circuit to be switched on.
Furthermore, the sampling/control circuit comprises a sampling circuit and a control circuit, the sampling circuit is used for collecting the voltage of the input connection end in real time, and the control circuit is used for controlling the on/off of the second switch circuit according to the voltage collected by the sampling circuit.
In a specific embodiment, the first switching circuit is configured as a first MOS transistor.
In a specific embodiment, the second switching circuit is configured as a second MOS transistor.
The rectifier circuit is arranged between the input power connection end and the output power supply end.
Referring to fig. 2, the present embodiment further discloses a specific circuit diagram of the input overvoltage protection circuit for the low-voltage lamp.
The rectifier circuit comprises a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, and the sampling/control circuit comprises a sampling circuit consisting of a first voltage stabilizing diode ZD1 and a control circuit consisting of a first resistor R1, a second resistor R2, a third resistor R3, a second voltage stabilizing diode ZD2 and a first capacitor C1; the first switch circuit is a first MOS transistor Q1, the second switch circuit is a second MOS transistor Q2, and the switch charging circuit comprises a fourth resistor R4, a fifth resistor R5, a second capacitor C2, a third capacitor C3 and a third zener diode ZD3 which are connected in series.
The working principle is as follows: when the input voltage of the input connection end (L, N) is too high, the voltage reaches or is greater than the voltage stabilization value of the first voltage stabilizing diode ZD1, at the moment, the first voltage stabilizing diode ZD1 leaks electricity in an opposite phase, then the voltage is divided by the first resistor R1, the second resistor R2 and the third resistor R3, and the load voltage of the first resistor R1 is used for triggering the on/off of the first MOS transistor Q1, wherein the second voltage stabilizing diode ZD2 plays a role in overvoltage clamping, and the first capacitor C1 plays a role in filtering; when the load voltage of the first resistor R1 is greater than the turn-on voltage of the first MOS transistor Q1, the first MOS transistor Q1 is turned on, the second MOS transistor Q2 is turned off, and overvoltage protection is started. When the input voltage of the input connection end (L, N) is in the working range and does not exceed the clamp value of the first voltage stabilizing diode ZD1, the first MOS tube Q1 is turned off, the second capacitor C2 is charged through the fourth resistor R4 and the fifth resistor R5 until the voltage of the second capacitor C2 is greater than the turn-on voltage of the second MOS tube Q2, so that the second MOS tube Q2 is turned on, and the LED power supply can normally work. Therefore, the circuit realizes the input overvoltage protection function by sampling the input voltage of the input electric terminals (L, N).
In summary, the input overvoltage protection circuit for the low-voltage lamp controls the second switch circuit to be turned on when the voltage of the input power connection end is greater than or equal to the set value, the output of the switch charging circuit is connected by the second switch circuit, and the first switch circuit is turned off, so that the circulation loop from the input power connection end to the output power supply end is cut off, the LED power supply is prevented from being damaged by the overhigh voltage, and the LED power supply can be effectively protected in time when the voltage is mistakenly connected.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the utility model. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. The input overvoltage protection circuit of the low-voltage lamp is characterized by comprising an input electric connection end for connecting commercial power and an output power supply end for connecting an LED power supply, wherein the positive input end of the input electric connection end is connected with the positive output end of the output power supply end, the negative input end of the input electric connection end is connected with the negative output end of the output power supply end, a first switch circuit is arranged between the negative input end and the negative output end,
still include sampling/control circuit, second switch circuit and switch charging circuit, sampling/control circuit's input is connected in the positive input with on the wire between the positive output, sampling/control circuit's output is connected in second switch circuit's signal input part, switch charging circuit's input is connected in the positive input with on the wire between the positive output, second switch circuit's input and first switch circuit's signal input part parallel connection in switch charging circuit's output, second switch circuit's output is connected in on the wire between negative input and the negative output and is located first switch circuit is close to one side of negative input,
the sampling/control circuit collects the voltage of the input power connection end in real time, when the voltage of the input power connection end is larger than or equal to a set value, the second switch circuit is controlled to be switched on, the output end of the switch charging circuit is communicated with the second switch circuit, and the first switch circuit is switched off; when the voltage of the input power connection end is smaller than a set value, the second switch circuit is switched off, and the output of the switch charging circuit controls the first switch circuit to be switched on.
2. The input overvoltage protection circuit of claim 1, wherein the sampling/control circuit comprises a sampling circuit and a control circuit, the sampling circuit is used for collecting the voltage of the input electric terminal in real time, and the control circuit is used for controlling the on/off of the second switch circuit according to the voltage collected by the sampling circuit.
3. The input overvoltage protection circuit for a low voltage lamp as claimed in claim 1, wherein said first switching circuit is configured as a first MOS transistor.
4. The input overvoltage protection circuit for a low voltage lamp as claimed in claim 1, wherein said second switching circuit is configured as a second MOS transistor.
5. The input overvoltage protection circuit for a low voltage lamp according to claim 1, further comprising a rectifier circuit, said rectifier circuit being disposed between said input electrical connection terminal and said output power supply terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121251051.3U CN215817508U (en) | 2021-06-04 | 2021-06-04 | Input overvoltage protection circuit of low-voltage lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121251051.3U CN215817508U (en) | 2021-06-04 | 2021-06-04 | Input overvoltage protection circuit of low-voltage lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215817508U true CN215817508U (en) | 2022-02-11 |
Family
ID=80175352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121251051.3U Active CN215817508U (en) | 2021-06-04 | 2021-06-04 | Input overvoltage protection circuit of low-voltage lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215817508U (en) |
-
2021
- 2021-06-04 CN CN202121251051.3U patent/CN215817508U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205070777U (en) | Switching power supply circuit | |
| CN104185333A (en) | Constant-current constant-voltage circuit and illuminating device | |
| CN217037504U (en) | LED dimming circuit and dimming LED lamp | |
| CN107666305B (en) | Intelligent switch | |
| CN104427698A (en) | Control circuit | |
| CN209658987U (en) | Low-voltage dc power supply with overvoltage protection | |
| CN215817508U (en) | Input overvoltage protection circuit of low-voltage lamp | |
| CN104953863A (en) | Switching power circuit for power supply of three-phase electric energy meter | |
| CN209375126U (en) | A kind of surge current suppression circuit | |
| CN113056061B (en) | Lamp tube with electric shock protection and compatibility of various power supply modes | |
| CN215956689U (en) | Inductive control circuit of switching power supply | |
| CN116191586A (en) | Quick charging loop for energy storage inductance winding of emergency lamp | |
| CN111405705B (en) | Dimming LED controller and output short-circuit protection method | |
| CN208623943U (en) | A kind of LED drive circuit | |
| CN208112507U (en) | A kind of dedicated DC-DC12V25A converter of electric vehicle with the normal output function of 12V | |
| CN207369376U (en) | A kind of emergency light circuit of invariable power | |
| CN217063256U (en) | Voltage protection circuit and electric device | |
| CN219329634U (en) | Charging conversion device | |
| CN111193412A (en) | Automatic uninterrupted power supply dual power supply system | |
| CN113271697B (en) | Double-end intelligent stepless dimming T8 LED lamp tube | |
| CN217470334U (en) | Time-delay turn-off circuit | |
| CN213638293U (en) | LED drive protection circuit | |
| CN218386833U (en) | Charging protection circuit, charging protection device and solar charger | |
| CN212183401U (en) | Power supply protection power supply circuit | |
| CN109921379B (en) | Electric energy meter switching-on and switching-off feedback circuit and switching-on and switching-off circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |